<html>

    <head>

        <meta charset="utf-8">

        <meta http-equiv="X-UA-Compatible" content="IE=edge">

        <meta name="viewport" content="width=device-width,initial-scale=1">



        <title>Running Endless App</title>

        <meta name="description" content="Enjoy running endlessly with this fun web app">

        <meta name="keywords" content="running, endless, web app">



        <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.6.0/jquery.min.js"></script>

        <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.0.2/dist/css/bootstrap.min.css" rel="stylesheet"

                integrity="sha384-EVSTQN3/azprG1Anm3QDgpJLIm9Nao0Yz1ztcQTwFspd3yD65VohhpuuCOmLASjC" crossorigin="anonymous">

        <link href="https://stackpath.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css" rel="stylesheet">

        <link href="https://fonts.googleapis.com/css?family=Poppins:400,700" rel="stylesheet">



        <script type="text/javascript">

            try {

                // App Javascript Goes Here. Place your entire script content inside the try block for error handling.

                let distance = 0;

                let interval;

                

                // This function updates the distance and displays it on the screen.

                function updateDistance() {

                    distance += 1;

                    $("#distance").text(distance);

                }

                

                // This function starts the running.

                function startRunning() {

                    interval = setInterval(updateDistance, 1000);

                    $("#startButton").prop("disabled", true);

                    $("#stopButton").prop("disabled", false);

                }

                

                // This function stops the running.

                function stopRunning() {

                    clearInterval(interval);

                    $("#startButton").prop("disabled", false);

                    $("#stopButton").prop("disabled", true);

                }

                

                // This will run when the DOM is ready.

                $(document).ready(function() {

                    $("#startButton").click(startRunning);

                    $("#stopButton").click(stopRunning);

                });



            } catch (error) {

                 // This will throw the error to the parent window.

                throw error;

            }

        </script>

        

        <style>

            /* App CSS Goes Here */

            body {

                background-color: #f8f9fa;

                font-family: 'Poppins', sans-serif;

            }

            

            h1 {

                text-align: center;

                margin-top: 50px;

                color: #343a40;

            }

            

            .container {

                max-width: 600px;

                margin: 0 auto;

                padding: 20px;

            }

            

            .distance-container {

                text-align: center;

                margin-bottom: 30px;

            }

            

            .distance-label {

                font-size: 24px;

                font-weight: bold;

                color: #343a40;

                margin-bottom: 10px;

            }

            

            .distance-value {

                font-size: 48px;

                color: #0d6efd;

                margin-bottom: 0;

            }

            

            .action-buttons {

                text-align: center;

            }

            

            .btn {

                margin-top: 10px;

            }

        </style>

    </head>

    <body>

        <div id="main-container" class="container">

            <h1>Running Endless App</h1>

            

            <div class="distance-container">

                <p class="distance-label">Distance (in meters)</p>

                <p id="distance" class="distance-value">0</p>

            </div>

            

            <div class="action-buttons">

                <button id="startButton" class="btn btn-primary">Start Running</button>

                <button id="stopButton" class="btn btn-danger" disabled>Stop Running</button>

            </div>

        </div>

    </body>

</html>